<template>
  <div class="ebook-slide-contents">
    <div class="slide-contents-search-wrapper">
      <div class="slide-contents-search-input-wrapper">
        <div class="slide-contents-search-icon">
          <span class="icon-search"></span>
        </div>
        <input
          class="slide-contents-search-input"
          type="text"
          v-model="searchText"
          :placeholder="$t('book.searchHint')"
          @keyup.enter.exact="search()"
          @click="showSearchPage()"
        />
      </div>
      <div
        class="slide-contents-search-cancel"
        v-if="searchVisible"
        @click="hideSearchPage()"
      >
        {{ $t("book.cancel") }}
      </div>
    </div>
    <div class="slide-contents-book-wrapper" v-show="!searchVisible">
      <div class="slide-contents-book-img-wrapper">
        <img :src="cover" class="slide-contens-book-img" />
      </div>
      <div class="slide-contents-book-info-wrapper">
        <div class="slide-contents-book-title">
          <span class="slide-contents-book-title-text">
            {{ metadata.title }}
          </span>
        </div>
        <div class="slide-contents-book-author">
          <span class="slide-contents-book-author-text">
            {{ metadata.creator }}
          </span>
        </div>
      </div>
      <div class="slide-contents-book-progress-wrapper">
        <div class="slide-contents-book-progress">
          <span class="progress">{{ progress + "%" }}</span>
          <span class="progress-text">{{ $t("book.haveRead2") }}</span>
        </div>
        <div class="slide-contents-book-time">{{ getReadTimeText() }}</div>
      </div>
    </div>
    <scroll
      class="slide-contents-list"
      :top="156"
      :bottom="48"
      ref="scroll"
      v-show="!searchVisible"
    >
      <div
        class="slide-contents-item"
        v-for="(item, index) in navigation"
        :key="index"
      >
        <span
          class="slide-contents-item-label"
          :style="contentItemStyle(item)"
          :class="{ selected: section === index }"
          @click="displayContent(item.href)"
        >
          {{ item.label }}
        </span>
        <span class="slide-contents-item-page">{{ item.page }}</span>
      </div>
    </scroll>
    <scroll
      class="slide-search-list"
      :top="66"
      :bottom="48"
      v-show="searchVisible"
    >
      <div
        class="slide-search-item"
        v-for="(item, index) in searchList"
        :key="index"
        v-html="item.excerpt"
        @click="displayContent(item.cfi, true)"
      ></div>
    </scroll>
  </div>
</template>

<script>
import { ebookMixin } from '../../utils/mixin'
import Scroll from '../common/Scroll'
import { px2rem } from '../../utils/utils'

export default {
  mixins: [ebookMixin],
  components: {
    Scroll
  },
  data() {
    return {
      searchVisible: false,
      searchList: null,
      searchText: ''
    }
  },
  methods: {
    // 二级目录缩进
    contentItemStyle(item) {
      return {
        marginLeft: `${px2rem(item.level * 15)}rem`
      }
    },
    // 显示搜索栏
    showSearchPage() {
      this.searchVisible = true
    },
    // 隐藏搜索栏
    hideSearchPage() {
      this.searchVisible = false
      this.searchText = ''
      this.searchList = null
    },
    // // 点击目录标题之后显示书籍内容,菜单隐藏
    // displayNavigation(target) {
    //   this.display(target, () => {
    //     this.hideTitleAndMenu()
    //   })
    // },
    // 全文搜索算法
    doSearch(q) {
      return Promise.all(
        this.currentBook.spine.spineItems.map(
          section => section.load(this.currentBook.load.bind(this.currentBook))
            .then(section.find.bind(section, q))
            .finally(section.unload.bind(section)))
      ).then(results => {
        // console.log(results)
        return Promise.resolve([].concat.apply([], results))
      })
    },
    // 搜索关键字方法
    search() {
      if (this.searchText && this.searchText.length > 0) {
        this.doSearch(this.searchText).then(list => {
          // console.log(list) list 一维数组
          this.searchList = list
          // 关键字高亮
          this.searchList.map(item => {
            // item.excerpt是字符（查找结果的文本内容）
            // console.log(item)
            // 通过replace 替换之前的关键字，并添加上样式，用v-html解析显示
            item.excerpt = item.excerpt.replace(this.searchText, `<span class="content-search-text">${this.searchText}</span>`)
            return item.excerpt
          })
        })
      }
    },
    // 点击搜索内容，显示书籍内容，而且关键字高亮,菜单隐藏
    // 点击目录标题之后显示书籍内容,菜单隐藏
    displayContent(target, highlight = false) {
      this.display(target, () => {
        this.hideTitleAndMenu()
        if (highlight) {
          // 关键字高亮 annotations管理高亮元素
          this.currentBook.rendition.annotations.highlight(target)
        }
      })
    }
  }
  // mounted() {
  //   // this.doSearch('added').then(list => {
  //   //   // console.log(list)
  //   //   // this.searchList = list
  //   //   this.currentBook.spine.spineItems.map(item => {
  //   //     // spin4e.spineItems有很多的section 根目录一致
  //   //     console.log(item)
  //   //   })
  //   // })
  // }

}
</script>

<style lang="scss" scoped>
@import "../../assets/styles/global";

.ebook-slide-contents {
  width: 100%;
  font-size: 0;
  .slide-contents-search-wrapper {
    display: flex;
    width: 100%;
    height: px2rem(36);
    margin: px2rem(20) 0 px2rem(10) 0;
    padding: 0 px2rem(15);
    box-sizing: border-box;
    .slide-contents-search-input-wrapper {
      flex: 1;
      @include center;
      .slide-contents-search-icon {
        flex: 0 0 px2rem(28);
        font-size: px2rem(12);
        @include center;
      }
      .slide-contents-search-input {
        flex: 1;
        width: 100%;
        height: px2rem(32);
        font-size: px2rem(14);
        background: transparent;
        border: none;
        &:focus {
          outline: none;
        }
      }
    }
    .slide-contents-search-cancel {
      flex: 0 0 px2rem(50);
      font-size: px2rem(14);
      @include right;
    }
  }
  .slide-contents-book-wrapper {
    display: flex;
    width: 100%;
    height: px2rem(90);
    padding: px2rem(10) px2rem(15) px2rem(20) px2rem(15);
    box-sizing: border-box;
    // background:orange;
    .slide-contents-book-img-wrapper {
      flex: 0 0 px2rem(45);
      .slide-contens-book-img {
        width: px2rem(45);
        height: px2rem(60);
      }
    }
    .slide-contents-book-info-wrapper {
      flex: 1;
      padding: 0 px2rem(10);
      .slide-contents-book-title {
        // 375*0.85=318.75-30=288.75-20=268.75-45=223.75-70=153.75
        // width: px2rem(153.75);
        font-size: px2rem(14);
        line-height: px2rem(16);
        @include left;
        .slide-contents-book-title-text {
          @include ellipsis2(3);
        }
      }
      .slide-contents-book-author {
        // width: px2rem(153.75);
        font-size: px2rem(12);
        line-height: px2rem(14);
        margin-top: px2rem(5);
        @include left;
        .slide-contents-book-author-text {
          @include ellipsis2(1);
        }
      }
    }
    .slide-contents-book-progress-wrapper {
      flex: 0 0 px2rem(70);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: flex-start;
      .slide-contents-book-progress {
        .progress {
          font-size: px2rem(14);
        }
        .progress-text {
          font-size: px2rem(12);
        }
      }
      .slide-contents-book-time {
        font-size: px2rem(12);
        margin-top: px2rem(5);
      }
    }
  }
  .slide-contents-list {
    padding: 0 px2rem(15);
    box-sizing: border-box;

    .slide-contents-item {
      display: flex;
      padding: px2rem(20) 0;
      box-sizing: border-box;

      .slide-contents-item-label {
        flex: 1;
        font-size: px2rem(14);
        line-height: px2rem(16);
        @include ellipsis;
      }

      .slide-contents-item-page {
        flex: 0 0 px2rem(30);
        font-size: px2rem(10);
        @include right;
      }
    }
  }
  .slide-search-list {
    width: 100%;
    padding: 0 px2rem(15);
    box-sizing: border-box;
    .slide-search-item {
      font-size: px2rem(14);
      line-height: px2rem(16);
      padding: px2rem(20) 0;
      box-sizing: border-box;
    }
  }
}
</style>
